code: def test_fit(self):
      gpa = prince.GPA()
      self.assertIsInstance(gpa.fit(self.shapes), prince.GPA)
  
file_path: prince/tests/test_gpa.py
imports: from __future__ import annotations
  import unittest
  import numpy
  import pandas
  import prince
label_desc: Use image node_id 2 for calling the TestGPA obj's underlying member method code with example usage: obj.test_fit() without return types